"At this point, if you just get into mean reversion – how far above or below trend can you be before you either throw back or snap back - you're reaching outer limits of what is sustainable," he added.

Worth also said that technical analysis compelled action.

"We would say, first of all, if you're long-only and you have some big gains, you've got to take measures," he said. "And if you have the fortitude, or if you're engaged in short-selling, we think this is a good thing to be short."

Trader disclosure: On Aug. 8, 2013, the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Fast Money" traders: Guy Adami is long C; Guy Adami is long GS; Guy Adami is long INTC; Guy Adami is long MSFT; Guy Adami is long AGU; Guy Adami is long NUE; Guy Adami is long BTU; Guy Adami's wife, Linda Snow, works at Merck; Brian Kelly is long Yen; Brian Kelly is long Euro; Brian Kelly is long British Pound; Brian Kelly is short US Dollar; Dan Nathan is long ZNGA; Dan Nathan is long FB Aug/Oct 38 call spread ; Dan Nathan is long JCP Aug 14 regular call spread ; Dan Nathan is short BBRY Jan 10/12 put spread; Karen Finerman is long AAPL; Karen Finerman is long BAC; Karen Finerman is long C; Karen Finerman is long JPM; Karen Finerman is long TGT; Karen Finerman is long M; Karen Finerman is long JCP; Karen Finerman is long FNP; Karen Finerman is long LYV; Karen Finerman is long IBM; Dan Telsey is long GPS; Dan Telsey is long M; Dan Telsey is long URBN; Dan Telsey is long TJX,